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Analog Devices Inc./Maxim Integrated MAX6791TPTD3+T
- Part No.:
- MAX6791TPTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX6791TPTD3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
The MAX6791TPTD3+T from Maxim Integrated is a dual-output, high-voltage linear regulator with integrated supervisory functions, designed for automotive power management. It delivers up to 150mA per output (OUT1 and fixed 5V OUT2), operates from 5V to 72V input, consumes only 68μA quiescent current, and features a 50ms reset timeout period with 87.5% reset threshold on OUT1 - enabling robust brownout recovery in engine control units.
For engineers reviewing the MAX6791TPTD3+T datasheet, MAX6791TPTD3+T pinout, MAX6791TPTD3+T application, or MAX6791TPTD3+T equivalent, key selection considerations include its dual-enable architecture (ENABLE1/ENABLE2), HOLD input for self-holding circuits, windowed watchdog capability (MAX6791 variant), and AEC-Q100-qualified thermal performance up to +125°C in the 20-pin TQFN package.
Technical Context
The MAX6791TPTD3+T implements two independent LDO regulators: OUT1 is adjustable (1.8V–11V) or preset (5V/3.3V/2.5V/1.8V), while OUT2 is fixed at 5V. Its supervisory block integrates a push-pull or open-drain RESET output with fixed 87.5% threshold relative to OUT1 and capacitor-adjustable or internally fixed (D3 = 50ms) timeout.
It features a windowed watchdog timer (tWD1 = 50ms fast timeout, tWD2 = 280ms slow timeout), selectable via WDS0/WDS1 pins, and supports reverse-battery protection via GATEP-driven pFET. The HOLD input enables latch-up behavior without external components, critical for ignition-controlled automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 72V - withstands automotive load-dump transients without external clamping |
| Quiescent Current | 68μA typical - enables always-on functionality in battery-sensitive systems |
| Output Current | 150mA per output (OUT1 & OUT2) - sufficient for MCU core + peripheral rail in body electronics |
| Reset Timeout | 50ms (D3 code) - ensures reliable microprocessor reset after voltage recovery |
| Reset Threshold | 87.5% of OUT1 nominal - provides hysteresis against noise-induced false resets |
| Dropout Voltage | 840mV typ @ 100mA (dual mode) - maintains regulation during cold-crank conditions down to 6V input |
| Operating Temp | -40°C to +125°C - fully specified for under-hood automotive environments |
Pinout & Package
Package: 20-pin, 5mm × 5mm thermally enhanced TQFN-EP (exposed pad grounded), rated for 2.7W continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - OUT1 | Regulator 1 output | Configurable 1.8V–11V or preset voltage; requires ≥10μF ceramic output capacitor |
| 3 - SET1 | Feedback adjust input | Grounded for preset output; connected to resistive divider for adjustable VOUT1 |
| 4 - PFO | Power-fail comparator output | Open-drain active-low signal triggered when PFI falls below 1.231V threshold |
| 5 - CSWT | Watchdog timeout adjust | Connected to OUT1 for fixed 280ms timeout; capacitor-to-GND enables adjustment |
| 6 - CSRT | Reset timeout adjust | Connected to OUT1 for fixed 50ms (D3) timeout; capacitor-to-GND enables scaling |
| 7 - GND | Power and signal reference | Primary ground return; exposed pad must be soldered to PCB ground plane |
| 8 - RESET | Supervisory reset output | Push-pull active-low; asserts when OUT1 drops below threshold or watchdog expires |
| 9, 10 - WDS1, WDS0 | Watchdog window ratio select | Set watchdog window (e.g., 8× ratio) or disable; required for MAX6791's windowed mode |
| 11 - WDI | Watchdog input | Edge-triggered; toggling within tWD1/tWD2 window prevents reset assertion |
| 12 - HOLD | Regulator hold enable | Active-low; latches ON state even after ENABLE1 is deasserted - enables self-hold circuits |
| 13, 14 - OUT2 | Fixed 5V regulator output | Dedicated 5V rail; independent of OUT1; requires ≥10μF output capacitance |
| 15 - ENABLE2 | OUT2 enable control | Active-high; internal 0.5μA pulldown allows direct MCU GPIO drive without pull-down resistor |
| 16 - PFI | Power-fail comparator input | Resistive-divider input referenced to 1.231V; used for battery voltage monitoring |
| 17, 18 - IN | Main regulator input | Accepts 5V–72V; bypassed with 1μF ceramic capacitor to GND near pin |
| 19 - GATEP | pFET gate driver | Drives external p-channel MOSFET for reverse-battery protection; eliminates series diode loss |
| 20 - ENABLE1 | OUT1 enable control | Active-high; internal 0.5μA pulldown - compatible with open-drain MCU outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable inputs | ENABLE1 controls OUT1; ENABLE2 controls fixed 5V OUT2 - enables staggered power sequencing |
| HOLD input with self-hold logic | Enables ignition-key-based latching without external MOSFET or feedback loop - reduces BOM count |
| Windowed watchdog timer | MAX6791-specific feature detecting both too-fast and too-slow WDI transitions - prevents firmware lockup |
| Reverse-battery protection drive | GATEP output drives pFET gate directly - eliminates 0.3V–0.7V diode drop and associated heat |
| Thermal & short-circuit protection | Shuts down at +165°C with 20°C hysteresis; limits short-circuit current to 200–240mA - ensures fault containment |
| AEC-Q100 qualified variants | MAX6791TPxx/V+ versions meet automotive stress testing - supports production deployment in ECU modules |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Powers 3.3V MCU core and 5V CAN transceiver from 12V battery under cold-crank (6V) and load-dump (72V) conditions. IC Role / Device Role / Timing Role: Dual-output LDO with independent EN control and HOLD-latched startup - manages power sequencing and ignition persistence. Use Value: 68μA quiescent current extends battery life in parked mode; 72V tolerance eliminates need for external TVS. | Use Scenario: Supplies 5V for door module microcontroller and 3.3V for LIN transceiver, with power-fail warning before battery disconnect. IC Role / Device Role / Timing Role: Supervisory regulator with PFI/PFO comparator and RESET - enables graceful shutdown and wake-on-LIN. Use Value: Adjustable PFI threshold (via resistor divider) allows precise low-battery detection; 50ms RESET holds MCU in reset until stable. |
| Advanced Driver Assistance System (ADAS) Camera ECU | Automotive Infotainment Power Tree |
Use Scenario: Provides clean 1.8V for image sensor and 3.3V for ISP in compact camera module exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-temp LDO (−40°C to +125°C) with thermal shutdown and watchdog - ensures fail-safe operation during thermal stress. Use Value: 2.7W thermal dissipation in 5mm × 5mm TQFN supports 150mA loads at +105°C ambient - avoids derating. | Use Scenario: Generates 5V auxiliary rail for USB hub and 3.3V for audio codec in head unit, with watchdog supervision of main SoC. IC Role / Device Role / Timing Role: Windowed watchdog (MAX6791) monitors SoC heartbeat - detects both frozen and runaway firmware states. Use Value: Dual timeout windows (50ms fast / 280ms slow) eliminate false resets from transient noise while catching true hangs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output automotive LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6792TPTD3+T | Same pinout and features, but includes programmable window ratio (8/16/64×) and faster minimum watchdog timeout (4.68ms) | Preferred where tighter watchdog timing control is needed for real-time safety-critical tasks | Select MAX6792TPTD3+T if window ratio flexibility or sub-10ms fast timeout is required; otherwise MAX6791TPTD3+T suffices |
| TLV70733PDPWR | Single-output, 200mA, 2.5V–5.5V input, no watchdog or RESET - lacks automotive voltage range and supervision | Only suitable for non-automotive, low-voltage, non-supervised applications | Not a functional substitute; use only in cost-sensitive, non-automotive designs without supervision needs |
Compared with MAX6792TPTD3+T, the MAX6791TPTD3+T offers identical dual-regulator architecture and 50ms reset but with fixed watchdog window ratios; versus TLV70733PDPWR, it provides full 5V–72V operation, integrated RESET/watchdog, and AEC-Q100 readiness - making it the sole viable option for automotive-grade dual-rail supervision.
Availability
MAX6791TPTD3+T is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and infotainment power trees requiring stable component supply across automotive temperature and voltage extremes.
Supply support for MAX6791TPTD3+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6791–MAX6796 product line targets automotive power management with ultra-low IQ, high-input-voltage LDOs integrating reset, watchdog, and power-fail supervision - specifically engineered for ECU, BCM, and ADAS subsystems.
FAQ
What output voltage options does the MAX6791TPTD3+T support?
The MAX6791TPTD3+T supports preset output voltages of 5.0V (OUT1), 3.3V, 2.5V, or 1.8V on OUT1, plus a fixed 5.0V on OUT2. OUT1 can also be adjusted from 1.8V to 11V using an external resistor divider connected to the SET1 pin. The "D3" in the part number indicates a 50ms reset timeout and 87.5% reset threshold on OUT1.
How does the HOLD function work on the MAX6791TPTD3+T?
The HOLD input on the MAX6791TPTD3+T is an active-low signal that latches the regulator ON state. Once ENABLE1 is asserted and OUT1 begins regulating, pulling HOLD low forces OUT1 to remain active even if ENABLE1 is later deasserted. Releasing HOLD (letting it float or pulling high) shuts down OUT1. This enables ignition-key-based self-holding circuits without external components - a key feature for automotive subsystems.
Is the MAX6791TPTD3+T AEC-Q100 qualified?
The MAX6791TPTD3+T itself is not explicitly marked as AEC-Q100 qualified in the datasheet; however, related variants such as MAX6795TPLD2/V+ and MAX6795TPSD2/V+ are AEC-Q100 qualified. The MAX6791TPTD3+T shares the same 20-pin TQFN package, -40°C to +125°C operating range, and automotive-focused design - and is widely deployed in automotive applications where qualification is managed at the system level.
Can the MAX6791TPTD3+T drive a p-channel MOSFET for reverse-battery protection?
Yes, the MAX6791TPTD3+T includes a dedicated GATEP pin that drives the gate of an external p-channel MOSFET to provide reverse-battery protection. When reverse polarity is applied, the internal circuitry pulls GATEP low to turn off the pFET, blocking current flow. This eliminates the power loss and heat generation of a series Schottky diode - improving efficiency in always-on automotive systems.
What is the difference between the MAX6791TPTD3+T and MAX6793TPTD3+T?
The MAX6791TPTD3+T features a windowed watchdog timer with WDS0/WDS1 inputs for ratio selection, while the MAX6793TPTD3+T replaces those pins with WD-DIS (watchdog disable) and uses a standard single-window watchdog. Both share identical dual-output regulation, 50ms reset timeout (D3), 5V–72V input, and TQFN-20 packaging. Choose MAX6791TPTD3+T when windowed watchdog detection is required; choose MAX6793TPTD3+T when simple watchdog enable/disable suffices.
MAX6791TPTD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Regulator/Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.053V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX6791TPTD3+T FAQ
1.How can I place an order for MAX6791TPTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6791TPTD3+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6791TPTD3+T reliable?
The price and inventory of MAX6791TPTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6791TPTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6791TPTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6791TPTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6791TPTD3+T?
MAX6791TPTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6791TPTD3+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6791TPTD3+T?
For technical support, including MAX6791TPTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6791TPTD3+T requirements.
6.How does Aetrix verify that MAX6791TPTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6791TPTD3+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6791TPTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6791TPTD3+T?
All MAX6791TPTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6791TPTD3+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6791TPTD3+T part is unused and in its original packaging.
Return procedure for MAX6791TPTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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